This machine was manufactured by Eurocopter in Germany and made the 6:th police-EC135 as it was delivered to the Swedish National Police in August of 2002. It was imported by the Swedish Eurocopter dealer Savback Helicopters. The aircraft has been stationed in Stockholm ever since, but the bases have changed. It began its operation at Arlanda Airport, but was later moved to Berga Heliport. As the Berga base was closed by the military in 2005 the helicopter moved to a temporary base at Myttinge Heliport. That base was closed in the autumn of 2009, as a consequence of the "helicopter heist" with SE-HON in September 2009. The two Stockholm helicopters (SE-HPU being the other one) were moved to a new base a bit north of Stockholm.

Upgraded to a P2+ (i)
SE-HPX was eventually modified from a P2 to a P2+, which gave the aircraft some extra power and an increased maximum take-off weight.

SE-HPU was the fourth EC 135 to be delivered to the Swedish National Police. It was brand new, but had earlier been registered D-HECN and D-HECH in Germany for trials and the helicopter acceptance. The helicopter was imported by the Swedish Eurocopter dealer Savback Helicopters.
On 17 April 2002 the helicopter started its journey to Sweden, from the Eurocopter Deutschland factory in Donauwörth. It was flown via the German towns Erfurt and Kassel (with an night stop in Erfurt). On the afternoon of 18 April the helicopter landed at the Swedish National Police's temporary base at Patria Ostermans Aero's heliport at Arlanda Airport in Stockholm. The helicopter was given the callsign POLIS 944 and put in service within a couple of days.
Due to the fact that the Stockholm based Polis 950 had been lost in a hangar fire a few months earlier POLIS 944 got based in Stockholm instead of Boden, where it was planned to be based.

The aircraft has been stationed in Stockholm ever since, but the bases have changed. It began its operation at Arlanda Airport, but was later moved to Berga Heliport. As the Berga base was closed by the military in 2005 the helicopter moved to a temporary base at Myttinge Heliport. That base was closed in late-2009 and the two Stockholm helicopters (SE-HPX being the other one) are now based a bit north of Stockholm.

Upgraded to a P2+ (i)
SE-HPU was eventually modified from a P2 to a P2+, which gave the aircraft some extra power and an increased maximum take-off weight.

SE-HPU was a frequent flyer. It flew an excess of 9000 hours during its first 10 years in service!

Retirement
In September 2012 the National Police took the formal decision to renew its fleet and replace its six EC135s, as well as to strengthen the structure with an additional aircraft to cover for the EC135 lost in 2007 (SE-HPS).
On 14 July 2014 Bell Helicopter announced that the Swedish National Police had signed a purchase agreement for seven Bell 429 helicopters.
The first Bell 429 (SE-JPU) was handed over on 1 October 2015, and it made its first official flight in service with the Swedish Police Authority on 27 October. The delivery of the remaining helicopters progressed in a rapid pace.

SE-HPX was the first EC135 to be sold. It was exported to Germany in February 2015. The helicopter was purchased by Helicopter Travel Munich (HTM), based at Emden Airport, which is focused in supporting the offshore windmill industry.